SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Feb. 25, 2018	Nov. 09, 2016
Discontinued operations, spinoff | Lamb Weston
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Distribution of the Company's interest in Lamb Weston (as a percent)		100.00%
Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASU 2018-02	$ 0.0
Accumulated other comprehensive loss | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASU 2018-02	(17.4)
Retained earnings | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of ASU 2018-02	$ 17.4